This week on A Prairie Home Companion: As we prepare the hay bales, the outdoor stage, and the mountains of meatloaf for next week's season opener and street dance at the Fitzgerald Theater, we bring you a special back-to-school rebroadcast compilation. With fight songs, pep bands, and Latin lessons, we cheer the return to academic life. Bob Dorough sings "3 is a Magic Number," Kate MacKenzie sings the old Carter Family song "Schoolhouse on the Hill," and at Lake Wobegon High School, Ms. Lewis retires from teaching English after 55 years. It's all about school this week, so please remember your number two pencils and spiral bound notebooks. There will be a quiz.